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- #include <bits/stdc++.h>
- using namespace std;
- long long a[200000],x[200000];
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- long long n,c,d,e,f,i,j,k,l;
- while(cin>>n)
- {
- long long a[20000];
- for(i=0;i<n;i++)
- {
- cin>>a[i];
- }
- sort(a,a+n);
- c=0;
- d=0;
- for(i=0;i<n;i+=2)
- {
- e=llabs(a[i]-a[i+1]);
- f=24-e;
- c+=min(e,f);
- }
- d+=min(llabs(a[0]-a[n-1]),(24-llabs(a[0]-a[n-1])));
- for(i=1;i<n-1;i+=2)
- {
- e=llabs(a[i]-a[i+1]);
- f=24-e;
- d+=min(e,f);
- }
- cout<<min(c,d)<<endl;
- }
- return 0;
- }
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